Connecting Battery Conditioner to 355

Any good chassis ground .. look for grounds that are attached to chassis and you can use that ..or in a pinch ..look for any screw /bolt go into the chassis and loosen that and use it

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There is a ground point on the subframe below the 3 positive terminal junction. It’s there for this reason. If has a hex head on it undo, insert the ground strap and refit the hex head bolt.

 

Just a strange suggestion. I bought a plug that goes into the cigarette lighter in the center console, you know, the 12v adaptors. I fused that to an extra trickle charger plug I had lying around.* And now I can just plug into my cig lighter to trickle charge the car. Your way looks more professional.

*Meaning cut off the alligator clips or whatever, and replaced with the cig lighter adapter.

 

There's a big earth bolt forward of the positive terminals shown in this thread...

https://www.ferrarichat.com/forum/threads/355-battery.634574/#post-147755688

It's a Challenge, but I recall the standard cars are similar.

 

I just ran that cable directly to the battery terminals through the frunk opening for the battery isolator.